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Добірка наукової літератури з теми "CFDST columns"

Автор: Grafiati

Опубліковано: 10 січня 2023

Оновлено: 28 січня 2023

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Статті в журналах з теми "CFDST columns"

Simon, Ms Sandra Mariam, and Ms Anju Thulasi. "Non Linear Analysis on CFDST columns with and without GFRP Wrapping." International Journal for Research in Applied Science and Engineering Technology 10, no. 7 (July 31, 2022): 612–16. http://dx.doi.org/10.22214/ijraset.2022.45379.

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Abstract: Concrete Filled Double Skin Steel Tube (CFDST) columns are modified form of Concrete Filled Steel Tubular (CFST) columns, developed by several researchers. CFDST column composed of two concentric steel tubes in which concrete is packed in between them. It is available in various geometrical shapes. CFDST have many advantages such as high strength, high bending stiffness, good seismic and fire performance. But it is found that CFDST columns have some disadvantages including ageing of structures, corrosion of steel tubes etc. which reduces the strength of the column. So, to prevent these drawbacks and to strengthen the structure, Glass Fiber Reinforced Polymer (GFRP) can be used as an external cover. The present study aims to do nonlinear static analysis of CFDST columns having different hollow ratio wrapped with and without GFRP under axial compression using ANSYS finite element analysis software.

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Bhatia, Sakshi, and Aditya Kumar Tiwary. "Concrete Filled Double Skinned Tubular Columns Subjected to Different Loading Conditions." IOP Conference Series: Earth and Environmental Science 889, no. 1 (November 1, 2021): 012050. http://dx.doi.org/10.1088/1755-1315/889/1/012050.

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Abstract The meteoric growth in light weight structures have opened on doors to many revolutionary concepts and innovations. Studies have manifested that the lowered weight of the structures somehow help to fight the material cost with a better seismic performance. The hollow core structures aimed reducing the structural weight with an improved structural performance as well. The Concrete filled double steel tubes (CFDST) can be taken as amalgamation of Hollow core columns and CFST i.e. single skinned columns. The co-relation of CFST and Hollow core columns gave birth to Concrete filled double skinned tubular columns (CFDST) which can possess the advantages of both the concepts. A sedulous review of concrete filled double skinned columns is being conveyed through this article. The behavior of confined concrete as well as the confining inner and outer steel in the CFDST model and its overall structural behavior is being succinctly reviewed in this article and a simultaneous comparison of CFDST columns to solid concrete/conventional columns is also being carried out where required.

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Ci, Junchang, Mizan Ahmed, Viet-Linh Tran, Hong Jia, and Shicai Chen. "Axial compressive behavior of circular concrete-filled double steel tubular short columns." Advances in Structural Engineering 25, no. 2 (October 19, 2021): 259–76. http://dx.doi.org/10.1177/13694332211046345.

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Анотація:

This article investigates the axial compressive performance of concrete-filled double steel tubular (CFDST) short columns composed of circular section loaded concentrically. An experimental program comprised of compression tests on short columns is carried out to examine their structural performance. Axial compression tests on conventional concrete-filled steel tubular (CFST) columns and double-skin concrete-filled steel tubular (DCFST) columns are also performed for comparison purposes. The test parameters include the diameter-to-thickness of the outer and inner steel tubes, concrete strength, and diameter ratio. The test results exhibit that CFDST short columns composed of the circular section have improved structural performance compared to its CFST and DCFST counterparts. A theoretical model is also presented to simulate the test ultimate strengths and load-axial strain relationships of CFDST columns. The existing design models proposed including the codified design specifications are evaluated against the collected test data for predicting the axial compressive strengths of circular CFDST columns. It is seen that the existing codified design models cannot yield their ultimate axial compressive strengths accurately. A practical artificial neural network (ANN) model is proposed to estimate the ultimate load of such columns loaded concentrically.

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Manigandan, R., and Manoj Kumar. "Non-linear Analysis of Axially Loaded Octagonal CFDST Short Columns." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (December 19, 2022): 435–42. http://dx.doi.org/10.38208/acp.v1.532.

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Анотація:

Concrete Filled Double-skin Steel Tube (CFDST) is a form of composite column that consists of outer steel and an inner steel tube and the space between them is filled with concrete. The structural response of CFDST columns is significantly affected by the thickness of outer and inner steel tubes and the compressive strength of infilled concrete. Although many studies have been in the past to understand the effect of inner and outer tubes thickness on the axial compressive response of circular CFDST columns, no such study appears in the context of octagonal CFDST columns. In this paper, the thickness of both inner and outer tubes is varied. Their effect on axial compressive behavior of CFDST columns containing the concrete of different grades is numerically examined. The non-linear FE analysis of CFDST columns is performed using the ABAQUS. The study shows that axial strength and ductility of octagonal section CFDST columns are significantly influenced by steel tube thickness and the grade of sandwiched concrete. Moreover, the study highlights the importance of the proper selection of inner and outer tube thickness for the better axial response of CFDST columns.

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Ci, Junchang, Mizan Ahmed, Hong Jia, Shicai Chen, Daxing Zhou, and Liqun Hou. "Experimental and numerical investigations of square concrete-filled double steel tubular stub columns." Advances in Structural Engineering 24, no. 11 (March 22, 2021): 2441–56. http://dx.doi.org/10.1177/13694332211004111.

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Анотація:

In this paper, the structural behavior of concrete-filled double steel tubular (CFDST) stub columns composed of square hollow sections is investigated experimentally and numerically. The experimental program comprises compression tests on short columns loaded concentrically. The test parameters mainly focused on the influences of the width-to-thickness ratios of steel tubes and concrete strength on the axial behavior of CFDST stub columns. Finite element (FE) models are also developed to investigate the influences of a wide range of structural parameters on their axial performance. It is observed that square CFDST columns have improved strength and ductility compared to their CFST and DCFST counterparts. Finally, a calculation formula is proposed to predict their ultimate compressive strengths under the axial compression load.

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Chen, Jing Yu, and Ying Hai. "Research on Bearing Capacity of Short Concrete Filled Double Skin Steel Tubes Columns under Axial Compression." Advanced Materials Research 168-170 (December 2010): 2154–57. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2154.

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Анотація:

The use of steel tube confined concrete columns has been the interests of many structural engineers. For investigation of the axially loading capacity of short concrete filled double skin tubes (CFDST) columns, axial compression loading experiments were carried on 9 short CFDST column samples. According to experimental results and with numerical analysis, an ultimate load estimation equation of CFDST column with one correction parameter is presented, the linear relation between the parameter and the inner-to-outer diameters ratio Di/Do is given out. The ultimate load estimation equation is validated by the test results of short CFDST column samples.

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Cui, Ying, Meimei Song, Zhan Qu, Shanshan Sun, and Junhai Zhao. "Research on Damage Assessment of Concrete-Filled Steel Tubular Column Subjected to Near-Field Blast Loading." Shock and Vibration 2020 (November 23, 2020): 1–19. http://dx.doi.org/10.1155/2020/8883711.

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Анотація:

Concrete-filled steel tubular (CFST) columns are widely used in engineering structures, and they have many different cross section types. Among these, normal solid sections and concrete-filled double-skin steel tubular sections are often used. Although many studies have been conducted on CFST columns with these two section types, no studies have been conducted on their damage assessment under blast loading. In this study, experimental analysis and a numerical simulation method were integrated to evaluate the responses and assess the damage of two concrete-filled steel tubular (CFST) columns with different cross sections subjected to near-field blast loading. The results showed that for a scaled distance of 0.14 m/kg1/3, plastic bending deformation occurred on the surfaces of the two CFST columns facing the explosive. The antiexplosion performance of the normal solid-section (NSS) CFST column was better than that of the concrete-filled double-skin steel tubular (CFDST) column. The explosion centre was set at the same height as the middle of column, and the distributions of the peak pressure values of the two columns were similar: the peak pressures at the middle points of the columns were the greatest, and the peak pressures at the bottom were higher than those at the top. With the analysis of the duration of the positive pressure, the damage at the middle was the most severe when subjected to blast loading. Using pressure-impulse damage theory and the validated numerical simulations, two pressure-impulse damage evaluation curves for NSS and CFDST columns were established separately by analysing the experimental and simulation data. Finally, based on the two pressure-impulse damage evaluation curves, the two pressure-impulse damage criteria for these two different fixed-end CFST columns were defined based on the deflection of the surfaces facing the explosives. Furthermore, the mathematical formulae for the two different column types were established to generate pressure-impulse diagrams. With the established formulae, the damage of the CFST columns with these two cross section types can be evaluated. Damage to other similar CFST columns with different cross section types due to near-field blast loading can also be evaluated by this method.

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Ahmed, Mizan, Qing Quan Liang, and Ahmed Hamoda. "Fiber element modeling of circular double-skin concrete-filled stainless-carbon steel tubular columns under axial load and bending." Advances in Structural Engineering 25, no. 5 (January 10, 2022): 1114–35. http://dx.doi.org/10.1177/13694332211065187.

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Анотація:

Circular concrete-filled double-skin steel tubular (CFDST) columns with external stainless-steel are high-performance composite columns that have potential applications in civil construction including the construction of offshore structures, bridge piers, and transmission towers. Reflecting the limited research performed on investigating their mechanical performance, this study develops a computationally efficient fiber model to simulate the responses of short and slender beam-columns accounting for the influences of material and geometric nonlinearities. Accurate material laws of stainless steel, carbon steel, and confined concrete are implemented in the mathematical modeling scheme developed. A new solution algorithm based on the Regula-Falsi method is developed to maintain the equilibrium condition. The independent test results of short and slender CFDST beam-column are utilized to validate the accuracy of the theoretical solutions. The influences of various column parameters are studied on the load-axial strain [Formula: see text] curves, load-lateral deflection [Formula: see text] curves, column strength curves, and interaction curves of CFDST columns. Design formulas are suggested for designing short and beam-columns and validated against the numerical results. The computational model is found to be capable of simulating the responses of CFDST short and slender columns reasonably well. Parametric studies show that the consideration of the concrete confinement is important for the accuracy of the prediction of their mechanical responses. Furthermore, high-strength concrete can be utilized to enhance their load-carrying capacity particularly for short and intermediate slender beam-columns. The strengths of CFDST columns computed by the suggested design model are in good agreement with the test and numerical results.

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Mohd Zuki, S. S., J. Jayaprakash, Shahiron Shahidan, and Ong Chong Yong. "Behavior of Fire Exposed Concrete-Filled Double Skin Steel Tubular (CFDST) Columns under Concentric Axial Loads." Applied Mechanics and Materials 773-774 (July 2015): 938–42. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.938.

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Анотація:

This paper presents the result of an experimental investigation of axial behavior of concrete-filled double skin steel tubular (CFDST) columns exposed to high temperature under the action of monotonically applied concentric axial loads. The columns were exposed to ASTM E-119 standard fire curve until 600°C and kept constant for two different exposure time (i.e., 60 and 90 minutes). Failure patterns and reduction in strength, ductility and stiffness of CFDST columns are reported. Factors influencing the strength, ductility and stiffness of CFDST columns during fire exposure, i.e., exposure time, temperature of concrete core and temperature of inner steel tube, are also discussed.

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İpek, S., and E. M. Güneyisi. "Ultimate Axial Strength of Concrete-Filled Double Skin Steel Tubular Column Sections." Advances in Civil Engineering 2019 (February 3, 2019): 1–19. http://dx.doi.org/10.1155/2019/6493037.

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Анотація:

This study aims at proposing a new model for evaluating the ultimate axial strength of concrete-filled double skin steel tubular (CFDST) composite columns. For this, a total of 103 experimental data regarding the ultimate strength of CFDST columns under axial loading were collected from the previous studies in the literature. All CFDST columns consist of two steel tubes being outer and inner circular hollow section. The model presented herein was developed by using gene expression programming. For this, the yield strength, diameter, and thickness of both outer and inner steel tubes, the compressive strength of annulus concrete, the length of the specimen, and the ultimate axial strength of the columns were utilized as the parameters. Assessment of the obtained results indicated that the generated model had a good performance compared to the existing models by the previous researchers and the equations specified in the design codes. The high value of R2 and narrow ranged fluctuation of the estimation error for the ultimate axial strength of the CFDST columns were also achieved through the proposed model.

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Більше джерел

Дисертації з теми "CFDST columns"

Zhao, H., R. Wang, Dennis Lam, C.-C. Hou, and R. Zhang. "Behaviours of circular CFDST with stainless steel external tube: Slender columns and beams." Elsevier, 2020. http://hdl.handle.net/10454/18141.

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Анотація:

No
In this work, experimental and numerical investigations were performed on the behaviours of circular concrete filled double steel tubular (CFDST) slender columns and beams, in which the external tube employed stainless steel tube. Eighteen specimens, 12 slender columns and 6 beams, were tested to obtain the failure patterns, load versus deflection relationships and strain developments of stainless steel tube. A finite element (FE) model was developed and verified by experimental results. The validated FE model was then employed to investigate the effects of key parameters, including hollow ratio, eccentric ratio and material strength, on the load-carrying capacity. The load distribution among the components and contact stress between steel tube and sandwiched concrete were also analyzed. Finally, the design methods for CFDST, hollow CFST and solid CFST members with carbon steel external tube respectively suggested by Han et al. (2018), Chinese GB 50936-2014 (2014) and AISC 360-16 (2016) were employed to evaluate their applicability for the circular CFDST slender columns and beams with stainless steel outer tube.
The authors gratefully acknowledge the Shanxi Province Outstanding Youth Fund (No. 201701D211006) and the National Natural Science Foundation (No. 51838008).
The full-text of this article will be released for public view at the end of the publisher embargo on 9th Nov 2021.

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Pons, Aliaga David. "ESTUDIO NUMÉRICO DE LA CAPACIDAD PORTANTE DE COLUMNAS MIXTAS CON DOBLE TUBO RELLENAS DE HORMIGON." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62209.

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[EN] Concrete-filled steel tubular columns composed of double-tube sections are a recent development. This type of sections are the result of applying a technique used in the construction of immersed tunnels, by forming a sandwich composite section made up of steel-concrete-steel. Apart from the own advantages of concrete-filled steel tubular (CFST) columns, double-tube columns present other additional advantages which make them of great interest for designers and engineers, such as: reduced weight, higher ductility, improved energy absorption and, above all, an enhanced fire resistance. In turn, the improvements in the manufacturing technique of high strength concrete makes their use in double-tube columns create the suitable synergy for the design of slender structural members. Nevertheless, the fast evolution and development of composite construction has led to a situation where the current design guidance cannot provide updated analytical expressions and recommendations. Give this situation, and due to the innovative nature of this configuration, as well as the complexity of experimental testing, few experimental and analytical works can be found on this typology of columns. This makes the numerical investigation of concrete-filled double-tube columns interesting from the scientific point of view. The mechanical behaviour of concrete-filled double-tube columns is studied in this thesis through a realistic three-dimensional finite element model. The values adopted for the variables of the model are the result of a comprehensive sensitivity analysis. The accuracy of the numerical model is verified against experimental tests and, once the numerical model is validated, an extensive parametric study is developed, with the aim of studying the influence of the main factors which affect the mechanical response of this columns and being able to provide design recommendations. With this information, a comparative study is carried out with the results of the application of the current calculation method for composite columns in Eurocode 4-Part 1.1, in order to evaluate the validity of the method for double-tube columns subjected to axial compression and combined compression and uniaxial bending, infilled with ultra-high strength concrete. The scope of this thesis is limited to slender circular double-tube columns filled with normal and ultra-high strength concrete subjected to monotonic concentric or eccentric axial load of uniform bending moment.
[ES] Las columnas tubulares de acero rellenas de hormigón compuestas de una sección de doble tubo son de reciente creación. Son el resultado de aplicar la técnica utilizada en la construcción de túneles sumergidos, de construir una sección compuesta tipo sándwich, a base de acero-hormigón-acero. Además de las ventajas propias de las columnas tubulares de acero rellenas de hormigón (CFST), las columnas de doble tubo poseen otras ventajas adicionales que las hace muy interesantes para proyectistas e ingenieros como son, por ejemplo: menor peso, mayor ductilidad, mayor absorción de energía, y sobretodo, mejor resistencia a fuego. Por otra parte, la mejora de la técnica de fabricación de hormigones de altas resistencias hace que su utilización en columnas de doble tubo produzca una sinergia idónea para diseñar elementos estructurales esbeltos. Sin embargo, la rápida evolución y desarrollo de la construcción mixta hace que las normas actuales no tengan las expresiones analíticas ni las recomendaciones de diseño actualizadas. Debido a ello y por la relativa solución innovadora de esta configuración, así como la complejidad de realizar ensayos experimentales, existen pocos trabajos experimentales y estudios analíticos acerca de esta tipología de columnas. Es por esto que el estudio numérico de columnas de doble tubo rellenas de hormigón sea, desde el punto de vista científico, interesante. El comportamiento mecánico de columnas de doble tubo rellenas de hormigón se estudia en esta tesis a través de un modelo realista tridimensional de elementos finitos. Los valores adoptados de las variables del modelo son el resultado de un amplio análisis de sensibilidad. La precisión del modelo numérico se verifica con ensayos experimentales y, una vez se dispone de un modelo validado, se desarrolla un extenso estudio paramétrico con el fin de evaluar la influencia de los principales factores que afectan la respuesta mecánica de las mismas y poder establecer recomendaciones de diseño. Con esa información, se realiza una comparativa con los resultados de aplicar el método de cálculo de columnas mixtas del Eurocódigo 4 - Parte 1.1, con el propósito de evaluar la validez del método en columnas de doble tubo comprimidas y flexo-comprimidas rellenas de hormigón de ultra alta resistencia. El alcance de esta tesis queda limitado a columnas circulares esbeltas de doble tubo rellenas de hormigón de resistencia normal y ultra alta resistencia sometidas a carga monotónica centrada y excéntrica de momento uniforme.
[CAT] Les columnes tubulars d'acer emplenades de formigó compostes d'una secció de doble tub són de recent creació. Són el resultat d'aplicar la tècnica utilitzada en la construcció de túnels submergits, de construir una secció composta tipus sandvitx, a base d'acer-formigó-acer. A més dels avantatges propis de les columnes tubulars d'acer emplenades de formigó (CFST), les columnes de doble tub posseeixen altres avantatges addicionals que les fa molt interessants per a enginyers com són, per exemple: menor pes, major ductilitat, major absorció d'energia, i sobretot, millor resistència a foc. D'altra banda, la millora de la tècnica de fabricació de formigons d'altes resistències fa que la seva utilització en columnes de doble tub produïsca una sinergia idònia per dissenyar elements estructurals verticals esvelts. No obstant això, la ràpida evolució i desenvolupament de la construcció mixta fa que les normes actuals no tinguin les expressions analítiques ni les recomanacions de disseny actualitzades. Per aquest motiu i per la relativa solució innovadora d'aquesta configuració, així com la complexitat de realitzar assajos experimentals, existeixen pocs treballs experimentals i estudis analítics sobre aquesta tipologia de columnes. És per això que l'estudi numèric de columnes de doble tub farcides de formigó siga, des del punt de vista científic, interessant. El comportament mecànic de columnes de doble tub emplenades de formigó s'estudia en aquesta tesi mitjançant un model realista tridimensional d'elements finits. Els valors adoptats per a les variables del model són el resultat d'una extensa anàlisi de sensibilitat. La precisió del model numèric es verifica amb assajos experimentals i, una vegada es disposa d'un model validat, es desenvolupa un extens estudi paramètric amb la finalitat d'avaluar la influència dels principals factors que afecten la resposta mecànica de les columnes i poder establir recomanacions de disseny. Amb aquesta informació, es realitza una comparativa amb els resultats d'aplicar el mètode de càlcul de columnes mixtes del Eurocódigo 4-Part 1.1, amb el propòsit d'avaluar la validesa del mètode en columnes de doble tub comprimides i flexo-comprimides emplenades de formigó d'ultra alta resistència. L'abast d'aquesta tesi queda limitat a columnes circulars esveltes de doble tub emplenades de formigó normal i d'ultra alta resistència sotmeses a càrrega monotònica centrada i excèntrica amb moment uniforme.
Pons Aliaga, D. (2016). ESTUDIO NUMÉRICO DE LA CAPACIDAD PORTANTE DE COLUMNAS MIXTAS CON DOBLE TUBO RELLENAS DE HORMIGON [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/62209
TESIS

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Abd, El Fattah Ahmed Mohsen. "Behavior of concrete columns under various confinement effects." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13533.

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Анотація:

Doctor of Philosophy
Department of Civil Engineering
Hayder Rasheed
The analysis of concrete columns using unconfined concrete models is a well established practice. On the other hand, prediction of the actual ultimate capacity of confined concrete columns requires specialized nonlinear analysis. Modern codes and standards are introducing the need to perform extreme event analysis. There has been a number of studies that focused on the analysis and testing of concentric columns or cylinders. This case has the highest confinement utilization since the entire section is under confined compression. On the other hand, the augmentation of compressive strength and ductility due to full axial confinement is not applicable to pure bending and combined bending and axial load cases simply because the area of effective confined concrete in compression is reduced. The higher eccentricity causes smaller confined concrete region in compression yielding smaller increase in strength and ductility of concrete. Accordingly, the ultimate confined strength is gradually reduced from the fully confined value fcc (at zero eccentricity) to the unconfined value f’c (at infinite eccentricity) as a function of the compression area to total area ratio. The higher the eccentricity the smaller the confined concrete compression zone. This paradigm is used to implement adaptive eccentric model utilizing the well known Mander Model and Lam and Teng Model. Generalization of the moment of area approach is utilized based on proportional loading, finite layer procedure and the secant stiffness approach, in an iterative incremental numerical model to achieve equilibrium points of P- and M- response up to failure. This numerical analysis is adaptod to asses the confining effect in circular cross sectional columns confined with FRP and conventional lateral steel together; concrete filled steel tube (CFST) circular columns and rectangular columns confined with conventional lateral steel. This model is validated against experimental data found in literature. The comparison shows good correlation. Finally computer software is developed based on the non-linear numerical analysis. The software is equipped with an elegant graphics interface that assimilates input data, detail drawings, capacity diagrams and demand point mapping in a single sheet. Options for preliminary design, section and reinforcement selection are seamlessly integrated as well. The software generates 2D interaction diagrams for circular columns, 3D failure surface for rectangular columns and allows the user to determine the 2D interaction diagrams for any angle  between the x-axis and the resultant moment. Improvements to KDOT Bridge Design Manual using this software with reference to AASHTO LRFD are made. This study is limited to stub columns.

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Alam, Md Iftekharul. "Behaviour of FRP strengthened steel tubular members subjected to transverse impact loading." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/105782/1/Md%20Iftekharul_Alam_Thesis.pdf.

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Анотація:

This PhD thesis is devoted to contributing to the existing knowledge of FRP (Fibre Reinforced Polymer) strengthened metallic structural members subjected to dynamic impacts. The outcome of this research will be beneficial to design structures for mitigating damage and failure due to lateral impact forces from transportation accidents, explosive attacks or from flying debris. A new series of laboratory tests results along with computer based structural analyses are presented to understand the effectiveness of FRP strengthening of tubular structural members. FRP strengthening found to be a promising sustainable option for minimising structural damage and human casualty due to impact loads.

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Pagoulatou, M., Therese Sheehan, Xianghe Dai, and Dennis Lam. "Finite element analysis on the capacity of circular concrete-filled double-skin steel tubular (CFDST) stub columns." 2014. http://hdl.handle.net/10454/9891.

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Анотація:

Yes
This paper presents the behaviour of circular concrete-filled double-skin steel tubular (CFDST) stub columns compressed under concentric axial loads. To predict the performance of such columns, a finite element analysis is conducted. Herein, for the accurate modelling of the double-skin specimens, the identification of suitable material properties for both the concrete infill and steel tubes is crucial. The applied methodology is validated through comparisons of the results obtained from the finite element analysis with those from past experiments. Aiming to examine the effect of various diameter-to-thickness (D/t) ratios, concrete cube strengths and steel yield strengths on the overall behaviour and ultimate resistance of the double-skin columns, a total of twenty-five models are created to conduct the parametric study. In addition, four circular concrete-filled steel tubes (CFST) are included to check the dissimilarities, in terms of their behaviour and weight, when compared with identical double-skin tubes. A new formula based on Eurocode 4 is proposed to evaluate the strength of the double-skin specimens. Based on the comparison between the results derived from the analysis, the proposed formulae for the concrete filled double-skin would appear to be satisfactory.

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Zhang, Fangrui. "Dynamic analysis of steel confined concrete tubular columns against blast loads." Thesis, 2017. http://hdl.handle.net/2440/104727.

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The use of composite construction has drawn more and more attention in recent decades. This thesis contains a number of journal articles which aim to enrich the knowledge of the performance of concrete filled tubular columns when subjected to blast loading. Experimental investigations are used in conjunction with numerical analysis to provide a thorough assessment of the blast-resistance of concrete filled tubular columns. The first chapter mainly focuses on the experimental study on concrete filled tubular columns under blast loading. A large-scale blast experimental program is carried out on concrete filled double-skin steel tube (CFDST) columns. The blast experiment aims to examine the blast-resistance of ten CFDST specimens, including five with square cross-section and the other five with circular cross-section. The parameters that are investigated during the blast experiment include: cross-sectional geometry, explosive charge weight and magnitude of axial load. After the experiment, several damaged test specimens are then transported back to the laboratory for residual axial load-carrying capacity tests. The proposed CFDST columns are able to retain more than 60% of its axial load-carrying capacity even after being subjected to close-range explosion. As blast experiments are often costly and associated with potential safety concerns, numerical tools have been adopted by more and more researchers. In the second chapter of the thesis, numerical approaches in modelling the dynamic behaviour of concrete filled steel tube (CFST) columns and CFDST columns under blast loading are presented. The numerical models are validated against the results of the blast experiment as described in the first chapter and good agreement is achieved. Parametric studies on the effect of column dimensions and material properties are also discussed through intensive numerical simulations. In the last chapter, a numerical method to generate pressure-impulse diagrams for CFDST columns is proposed which uses a damage criterion involving the residual axial load-carrying capacity. Based on the numerical method, pressure-impulse diagrams for different column configurations are derived and analytical expressions of deriving pressure-impulse diagrams for CFDST columns are also developed through regression analysis.
Thesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Civil, Environmental & Mining Engineering, 2017.

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Ren, Q.-X., C. Hou, Dennis Lam, and L.-H. Han. "Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns." 2014. http://hdl.handle.net/10454/10283.

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Tapered concrete filled double skin steel tubular (CFDST) columns have been used in China for structures such as electricity transmission towers. In practice, the bearing capacity related to the connection details on the top of the column is not fully understood. In this paper, the experimental behaviour of tapered CFDST stub columns subjected to axial partial compression is reported, sixteen specimens with top endplate and ten specimens without top endplate were tested. The test parameters included: (1) tapered angle, (2) top endplate thickness, and (3) partial compression area ratio. Test results show that the tapered CFDST stub columns under axial partial compression behaved in a ductile manner. The axial partial compressive behaviour and the failure modes of the tapered CFDST stub columns were significantly influenced by the parameters investigated. Finally, a simple formula for predicting the cross-sectional capacity of the tapered CFDST sections under axial partial compression is proposed.

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Ahmed, Mizan. "Experimental and Numerical Studies of Concrete-Filled Double Steel Tubular Columns." Thesis, 2020. https://vuir.vu.edu.au/40437/.

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Concrete-filled double steel tubular (CFDST) columns are high-performance composite columns, which have increasingly been used in high-rise composite buildings and bridges as well as in strengthening conventional concrete-filled steel tubular (CFST) columns. The additional confinement provided by the inner circular tube in CFDST columns considerably improves their strength and ductility compared to CFST columns. However, research studies on the behavior of CFDST columns have been very limited and no design rules are given in current design codes. This thesis presents experimental and numerical studies on the fundamental behavior of circular and rectangular CFDST short and slender columns subjected to axial compression, combined axial load and bending, and preloads. Experiments on the behavior of square CFDST short columns with circular inner tube, circular CFDST short columns with circular inner tube and rectangular CFDST short columns composed of inner rectangular tube loaded concentrically and eccentrically are undertaken. Fiber-based mathematical models are developed for predicting the structural responses of CFDST short and slender columns under various loading conditions. The formulations of the mathematical models consider the influences of concrete confinement, geometric and material nonlinearities, and local buckling. New confining pressure models are proposed based on test results for ascertaining the compressive and residual strengths of confined concrete in CFDST columns, and incorporated in the mathematical models. The highly dynamic nonlinear equilibrium equations of CFDST columns under eccentric loading are solved by the efficient computer solution algorithms, which are developed based on the inverse quadratic method. The validations of the numerical models are made by comparisons with experimental results. The influences of various geometric and material parameters on the behavior of CFDST columns are examined. The results obtained from experimental and numerical studies are used to propose design equations. This research makes significant contributions to the knowledge by adding new test results on CFDST short columns to the database. The numerical models developed provide researchers and structural designers with accurate and efficient computer simulation and design tools, which lead to safer and more economical designs of composite structures. The design equations proposed can be utilized to design CFDST short and slender columns under various loading conditions.

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Ren, Q.-X., L.-H. Han, Dennis Lam, and C. Hou. "Experiments on special-shaped CFST stub columns under axial compression." 2014. http://hdl.handle.net/10454/5929.

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This paper is an attempt to study the behavior of axially loaded concrete filled steel tubular (CFST) stub columns with special-shaped cross-sections, i.e. triangular, fan-shaped, D-shaped, 1/4 circular and semi-circular. A total of forty-four specimens including CFST stub columns and reference hollow steel tubular stub columns were tested. The effects of the changing steel tube wall thickness and the infill of concrete on the behavior of the composite columns were investigated. The results showed that the tested special-shaped CFST stub columns behaved in a ductile manner, and the composite columns showed an outward local buckling model near the middle section. Generally, the failure modes of these five kinds of special-shaped specimens were similar to those of the square CFST stub columns. Finally, simplified model for predicting the cross-sectional strength of the special-shaped CFST sections was discussed and proposed.

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Ren, Q.-X., L.-H. Han, Dennis Lam, and W. Li. "Tests on elliptical concrete filled steel tubular (CFST) beams and columns." 2014. http://hdl.handle.net/10454/10304.

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This paper presents a series of test results of elliptical concrete filled steel tubular (CFST) beams and columns to explore their performance under bending and compression. A total of twenty-six specimens were tested, including eight beams under pure bending and eighteen columns under the combination of bending and compression. The main parameters were the shear span to depth ratio for beams, the slenderness ratio and the load eccentricity for columns. The test results showed that the CFST beams and columns with elliptical sections behaved in ductile manners and were similar to the CFST members with circular sections. Finally, simplified models for predicting the bending strength, the initial and serviceability-level section bending stiffness of the elliptical CFST beams, as well as the axial and eccentric compressive strength of the composite columns were discussed.

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Частини книг з теми "CFDST columns"

Han, Lin-Hai, Dennis Lam, and David A. Nethercot. "Design of CFDST Columns." In Design Guide for Concrete-Filled Double Skin Steel Tubular Structures, 21–48. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, [2019]: CRC Press, 2018. http://dx.doi.org/10.1201/9780429440410-3.

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Geng, Yue, Gianluca Ranzi, Yu-yin Wang, Raymond Ian Gilbert, and Sumei Zhang. "State-of-the-art review on the time-dependent behaviour of composite steel-concrete columns." In Time-dependent behaviour and design of composite steel-concrete structures, 83–109. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/sed018.ch5.

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<p>This chapter presents a state-of-the-art review of the time-dependent behaviour of composite columns. The first part of the chapter outlines the available typologies and advantages of composite columns. This is followed by an overview of the time-dependent response of concrete (specific to composite columns) and an introduction to concrete confinement. The main part of the chapter is devoted to the state-of-the-art review on how concrete time effects influence the long-term and ultimate behaviour of concrete-filled steel tube (CFST) columns, and on the combined effects produced by sustained loading and chloride corrosion on CFST columns. The review then deals with the long-term behaviour of concrete-filled double skin tube (CFDST) and encased composite columns. The final parts of the chapter provide a review of the time-dependent differential axial shortening (DAS) in vertical components of multi-storey buildings and on the long-term response of arch bridges.</p>

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Zhang, Yufen, and Degang Guo. "Compressive Stiffness of CFDST Columns." In Springer Tracts in Civil Engineering, 49–63. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8089-5_3.

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Rust, J. P., and T. N. Haas. "Evaluating the effect of load eccentricity on slender circular CFDST columns." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 373–74. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-176.

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Rust, J. P., and T. N. Haas. "Evaluating the effect of load eccentricity on slender circular CFDST columns." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 1079–85. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-176.

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Haas, T. N., A. A. Usongo, and J. A. Koen. "Calibration and validation of slender circular CFDST columns subjected to eccentric loading." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 367–68. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-173.

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Haas, T. N., A. A. Usongo, and J. A. Koen. "Calibration and validation of slender circular CFDST columns subjected to eccentric loading." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 1061–66. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-173.

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Usongo, A. A., and T. N. Haas. "Evaluation of parameters which influence circular slender CFDST columns subjected to eccentric loading." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 371–72. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-175.

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Usongo, A. A., and T. N. Haas. "Evaluation of parameters which influence circular slender CFDST columns subjected to eccentric loading." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 1073–78. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-175.

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Usongo, A. A., and T. N. Haas. "Investigation of CDP parameters and concrete confinement models for use in circular slender CFDST columns subjected to eccentric loading." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 369–70. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-174.

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Тези доповідей конференцій з теми "CFDST columns"

Sulthana, U. Mashudha, and S. Arul Jayachandran. "Investigations on global buckling behaviour of concrete-filled double-skinned steel tubular columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7144.

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Concrete-Filled Double-skinned Steel Tubular columns (CFDST) are proved to possess exceptional structural resistance in case of fire and multi-hazard situations. This superior quality of CFDST makes it preferable in long column applications. However, studies on the long column behaviour of CFDST is very few, and their results are not in line with the behaviour of CFST long columns. Whereas, several researches on stub column CFDST shows that, the axial compression behaviour of CFDST is similar to CFST. In this paper, selected results (4 numbers of circular CFDST specimens) from a large test data is presented. Axial compression behaviour of long column CFDST specimens is studied, with non-dimensional slenderness λ around 1.0, and hollowness ratio as the governing parameter for study. Test results namely, axial load carrying capacity, axial deformation and lateral deflection are presented in this paper. Numerical models are also developed and validated with the experimental results, to carry out more parametric studies. Further, the experimental axial capacity values are compared with modified capacity equations from EC4 and AISC. Results show that extended EC4 and AISC equations gives conservative predictions for CFDST column even in the long column range. Moreover, the initial imperfections in the specimen and their corresponding boundary conditions for load application, are found to be governing parameters in long column buckling study.

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Wencong, Li. "Axial Compression Behaviour of Concrete-Filled Double-Layer Steel Tubular Column." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.1214.

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<p>Nowadays, height of supertall buildings with height over 300 meters have been successively renewed in the world. To improve the global stability of the supertall building, mega-columns with excellent seismic, wind-resistance and axial compressive performance are recommended to be set in its perimeter. Concrete-filled double-layer steel tubular column (CFDLT column) transforming from the concrete-filled double-skin steel tubular column (CFDST column) by filling the hollow part of cross-section with concrete was proposed by the author. In this study, axial compression tests of CFDLT column, CFDST column and conventional concrete-filled steel tubular column (CFT column) specimens were carried out to investigate the axial compression behaviour of them. The experimental results showed that the CFDLT column specimen exhibits higher axial compressive strength and larger energy dissipation capacity than the CFDST column and the conventional CFT column specimens. It was found that the axial stiffness of CFDLT column degrades slower than that of the conventional CFT column right after the peak load. And, it is expected that the CFDLT column can be used as a mega-column in the tomorrow’s supertall buildings.</p>

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Liu, Xiao, Jianye Xu, and Bing Wang. "Behavior of concrete-filled double skin steel tubular columns under eccentric compression after fire." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7008.

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Abstract: To analysis the behavior of the mechanical properties of concrete-filled double skin steel tubular (CFDST) columns under eccentric loads after fire, the finite element analysis was used. The established FEA modeling was verified by the experimental results which has a good agreement. The FEA modeling was then used to perform the temperature field and the full-range load-deformation relations of the CFDST subject to eccentric compression after exposed to fire. The results indicate that: with the time of fire increasing, the eccentric distance increasing, the steel ratio decreasing, the yield strength decreasing and compressive strength decreasing, the bearing capacity of CFDST in circle section under eccentric loads is showing a decrease trend, and the stiffness of component decreases with the time of fire increasing, the eccentric distance increasing and the steel ratio decreasing. The ductility of CFDST became better with the time of fire increasing and the eccentric distance increasing.

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Wang, Fangying, Ben Young, and Leroy Gardner. "Numerical study of concrete-filled austenitic stainless steel CHS stub columns with high-strength steel inner tubes." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.8273.

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A numerical modelling programme simulating the structural behaviour of concrete-filled double skin tubular (CFDST) stub columns with stainless steel outer tubes and high strength steel inner tubes is presented in this paper. The numerical model, which was developed using the finite element package ABAQUS, was initially validated against existing experimental results considering ultimate load, load-deflection histories and failure modes, with good agreement observed. Upon validation of the FE model, an extensive parametric study was undertaken whereby the cross-section slendernesses of the outer and inner tubes, the strength of the inner tube and the concrete grades were varied. These generated results together with the experimental data were then employed to assess the suitability of the design provisions of the European Standard EN 1994-1-1 and American Specification for concrete-filled tubes. Modifications to these design rules are also proposed, and a reduction factor (η) is suggested to account for the effective compressive strength in high strength concrete.

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Tan, Qinghua, Leroy Gardner, Linhai Han, and Dianyi Song. "Analysis of concrete-filled stainless steel tubular columns under combined fire and loading." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7206.

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In fire scenarios, concrete-filled stainless steel tubular (CFSST) columns undergo initial loading at ambient temperature, loading during the heating phase as the fire develops, loading during the cooling phase as the fire dies out and continual loading after the fire. CFSST columns may fail some points during this process under combined fire and loading. In this paper, the failure modes and corresponding working mechanism of CFSST columns subjected to an entire loading and fire history are investigated. Sequentially coupled thermal-stress analyses in ABAQUS are employed to establish the temperature field and structural response of the CFSST column. To improve the precision of the finite element (FE) model, the influence of moisture on the thermal conductivity and specific heat of concrete during both the heating and cooling phases is considered using subroutines. Existing fire and post-fire test data of CFSST columns are used to validate the FE models. Comparisons between predicted and test results confirm that the accuracy of the FE models is acceptable; the FE models are then extended to simulate a typical CFSST column subjected to the entire loading and fire history. The behaviour of the CFSST column is explained by analysis of the temperature distribution, load versus axial deformation curves and failure response.

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Güler, Soner, Fuat Korkut, Namik Yaltay, and Demet Yavuz. "Axial behaviour of concrete filled steel tube stub columns: a review." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7602.

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Concrete-filled steel tubular (CFST) columns are widely used in construction of high-rise buildings and peers of bridges to increase the lateral stiffness of the buildings, the axial load capacity, ductility, toughness, and resistance of corrosion of the columns. The CFST columns have much superior characteristics compared with traditionally reinforced concrete columns. The position of the concrete and steel tube in the cross-section of the CFST column is the most appropriate solution in terms of the strength and ductility. The steel tube, which is placed outside of the cross-section of the column, withstand the bending moment effectively. The concrete that is placed into the steel tube delay the local buckling of the steel tube and increase the axial load capacity of the column due to continually lateral confining. This paper presents a review on experimental results of the axial behavior of CFST columns performed by various researchers.

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Han, Lin-Han, and Kan Zhou. "Fire performance of concrete-encased CFST columns and beam-column joints." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6927.

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Concrete-encased CFST (concrete filled steel tube) structure is a type of composite structure featuring an inner CFST component and an outer reinforced concrete (RC) component. They are gaining popularity in high-rise buildings and large-span buildings in China nowadays. To date, the behaviour of concrete-encased CFST structures at ambient temperature has been investigated, but their fire performance has seldom been addressed, including the performance in fire and after exposure to fire. This paper summarizes the fire test results of concrete-encased CFST columns and beam-column joints. The cruciform beam-column joint was composed of one continuous concrete-encased CFST column and two cantilevered reinforced concrete (RC) beams. These specimens were subjected to a combined effect of load and full-range fire. The test procedure included four phases, i.e. a loading phase at ambient temperature, a standard fire exposure phase with constant load applied, a sequential cooling phase and a postfire loading phase. The main findings are presented and analysed. Two types of failure were identified, i.e. the failure during fire exposure and the failure during postfire loading. Global buckling failure was observed for all the column specimens. The column specimens with common load ratios achieved high fire ratings without additional fire protection. The concrete-encased CFST columns also retained high postfire residual strength. As for the joint members, beam failure was observed in all cases. The measured temperature-time history and deformation-time history are also presented and discussed. For both the column and joint specimens, the deformation over the cooling phase was significantly greater than that in the standard fire exposure phase.

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Tao, Zhong, Utsab Katwal, Kamrul Hassan, and Wen-Da Wang. "Simplified numerical modelling of rectangular concrete-filled steel columns, beams and beam-columns." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.6949.

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Because of its computational efficiency, simplified numerical modelling is the preferred method to simulate structural frames for routine design. As for concrete-filled steel tubular (CFST) columns, fibre beam element (FBE) modelling is often used in the simplified simulation. However, the accuracy of FBE modelling is greatly affected by the accuracy of the input material models, which should directly account for the interaction between the steel tube and core concrete. In this paper, simple yet accurate material models of steel and concrete are proposed for rectangular CFST columns by utilising a large amount of numerical data generated from detailed three-dimensional finite element modelling of stub columns. The material models are then incorporated into the simplified FBE simulation of rectangular CFST columns, beams and beam-columns. The accuracy of the simplified FBE simulation is verified by a wide range of experimental results on rectangular CFST stub columns, slender columns, beams and beam-columns.

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"An Experimental Investigation on Concrete Filled Steel Tube Columns Under Axial Compression." In Recent Advancements in Geotechnical Engineering. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901618-9.

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Abstract. This paper presents an experimental investigation on the behaviour of concrete filled steel tube columns under axial compression. The steel columns were filled with self-compacting and self-curing concrete instead of normal conventional concrete. A test program consisting of square column, circular column and rectangular column was firstly conducted. The behaviour of three concrete filled steel tubular sections (CFSTs) under axial load is presented. The effect of steel tube dimensions, shapes and confinement of concrete are also examined. Measured column strengths are compared with the values predicted by Euro code 4 and American codes. Euro code 4, gives good estimation of self-compaction concrete. However, lower values as measured during the experiments were predicted by the American Concrete Institute (ACI) equation. Also, the effect of thickness of steel tubes, concrete cube strength and steel percentage is also studied. In addition to CFST column the steel tube also acts as confinement for concrete.

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Ibáñez, Carmen, Luke Bisby, David Rush, Manuel L. Romero, and Antonio Hospitaler. "Analysis of concrete-filled steel tubular columns after fire exposure." In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7193.

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Concrete filled steel tubular (CFST) columns have a high probability to resist high temperatures compared to steel structures, whose evaluation after a fire is limited by the resulting deformation. A better understanding of the behaviour of CFST columns after a fire, affected by the maximum temperature achieved by the concrete infill, is required to properly estimate their residual strength and stiffness in order to adopt a reasonable strategy with minimum post-fire repair. In this paper, a fiber beam model for the simulation of the post-fire response of slender concrete-filled steel tubular (CFST) columns is presented. First, the model is validated against experimental results and subsequently it is employed to analyse the post-fire response of circular CFST columns. The variation of the residual strength with the load level for realistic fire resistance times is numerically studied. Actually, in a building, the columns support load even while a fire is being extinguished, so it is important to take into account this loading condition when predicting the post-fire behaviour. Therefore, in this research, the complete analysis comprises three stages: heating, cooling and post-fire under sustained load conditions. The model considers realistic features typical from the fire response of CFST columns, such as the existence of a gap conductance at the steel-concrete interface or the sliding and separation between the steel tube and the concrete.

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Звіти організацій з теми "CFDST columns"

Pedro F., Rodrigues, Vellasco Pedro C. G. da S., Lima Luciano R. O. de, Silva André T. da, Rodrigues Monique C., and Sarmanho Arlene M. C. EXPERIMENTAL EVALUATION OF COMPOSITE TUBULAR COLUMNS CFDST (STAINLESS STEEL–CONCRETE–CARBON STEEL). The Hong Kong Institute of Steel Construction, December 2019. http://dx.doi.org/10.18057/icass2018.p.025.

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Song, Qian-Yi, Lin-Hai Han, Kan Zhou, and Yuan Feng. TEMPERATURE DISTRIBUTION OF CFST COLUMNS PROTECTED BY INTUMESCENT FIRE COATING. The Hong Kong Institute of Steel Construction, December 2018. http://dx.doi.org/10.18057/icass2018.p.164.

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FINITE ELEMENT SIMULATION FOR ULTRA-HIGH-PERFORMANCE CONCRETE-FILLED DOUBLE-SKIN TUBES EXPOSED TO FIRE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.263.

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Ultra-high-performance concrete (UHPC) or ultra-high-strength concrete (UHSC) are alternatively used to reduce construction materials, thereby achieving more sustainable constructions. Moreover, engaging the advantages of concrete cores and outer steel tubes in concrete-filled steel tubes (CFST) or ductile concrete-filled double-skin tubes (CFDST) is of great interest for the better performance of such members under fire. Nevertheless, current design provisions do not provide design models for UHPC-filled double-skin tubes under fire, and existing finite-element (FE) methodologies available in the literature may not accurately simulate the behaviour of CFDST exposed to fire. Therefore, this paper develops a comprehensive FE protocol implementing the scripting technique to model CFDST members for heat transfer and coupled (simultaneously or sequentially) thermal-stress analyses. Various modelling parameters incorporated in the proposed FE routine include the cross-sectional geometry (circular, elliptical, hexagonal, octagonal, and rectangular), the size (width, diameter, and wall thickness), interactions, meshing, thermal- and mechanical-material properties, and boundary conditions. The detailed algorithm for heat transfer analysis is presented and elaborated via a flow chart. Validations, verifications, and robustness of the developed FE models are established based on extensive comparison studies with existing fire tests available in the literature. As a result, and to recognize the value of the current FE methodology, an extensive parametric study is conducted for different affecting parameters (e.g., nominal steel ratio, hollowness ratio, concrete cylindrical strength, yield strength of metal tubes, and width-to-thickness ratio). Extensive FE results are used for optimizing the fire design of such members. Consequently, a simplified and accurate analytical model that can provide the axial load capacity of CFDST columns under different fire ratings is presented

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PARAMETRIC STUDIES ON THE MOMENT RESISTANT BEAMCOLUMN CONNECTION BEHAVIOR OF CONCRETE FILLED DOUBLE STEEL TUBULAR COLUMNS AND I STEEL BEAMS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.284.

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The configuration of Concrete filled double steel tubular cross-section (CFDST) has the potential to overcome the beam-column connection difficulties found in steel tubular cross-sections. Since experimental parametric studies are expensive, numerical methods are adopted in this study to understand the behavior of beam-CFDST column connection under monotonic and cyclic loading conditions. The connection type is observed to be as semi-rigid as per EN1993-1-8. Parametric study includes design parameters like, concrete infill strength, yield strength of inner steel tube and outer steel tube, hollowness ratio, width to thickness ratio of inner steel tube and outer steel tube, end plate thickness and provision of stiffeners for end plate. Thickening the inner steel tube locally at the bolt location and providing stiffener plate or bracket at the compression zone of the extended end plate improves the rotational capacity of the connection as high as 0.06 rad for full plastic moment capacity of the beam. Recommendations are given for proportioning the connection components like end plates, bolts, inner steel tube and stiffeners for an optimal semi-rigid connection design.

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AXIAL COMPRESSION BEHAVIOR OF SQUARE THIN-WALLED CFST COLUMN TO RC BEAM JOINTS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.288.

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Анотація:

To investigate the influence of eccentricity ratio and slenderness ratio on the mechanical properties of eccentric compressed concrete filled steel tubular (CFST) lattice column, the ultimate bearing capacity tests of 20 K shape arrangement lacing strip of four-tube CFST columns were conducted. Based on the stress-strain relationship of CFST and the influence of shear deformation, the equilibrium equation of the mid-section is established and a numerical method for the ultimate bearing capacity of CFST lattice column is proposed. The slenderness reduction coefficient calculation model and equivalent slenderness ratio formula of CFST lattice column are established. Combined with the numerical results and the slenderness ratio reduction coefficient calculation model, the formula of slenderness ratio reduction coefficient is put forward. The comparison between theoretical analysis and experimental results shows that the calculation method of elastic-plastic ultimate bearing capacity of CFST lattice column proposed in this paper is quite accurate. The research outcomes can provide a reference for the application of CFST lattice column and revision of current specifications.

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CALCULATION METHOD OF ULTIMATE LOAD BEARING CAPACITY OF CONCRETE FILLED STEEL TUBULAR LATTICE COLUMNS. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.095.

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Анотація:

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BEHAVIOR OF CFST-COLUMN TO STEEL-BEAM JOINTS IN THE SCENARIO OF COLUMN LOSS. The Hong Kong Institute of Steel Construction, March 2019. http://dx.doi.org/10.18057/ijasc.2019.15.1.7.

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SEISMIC OPTIMIZATION ANALYSIS OF VERTICAL STIFFENER CONNECTION TO L-CFST COLUMN. The Hong Kong Institute of Steel Construction, March 2019. http://dx.doi.org/10.18057/ijasc.2019.15.1.13.

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BEHAVIOUR OF IMPROVED DIRECT-WELDED CONNECTIONS IN SQUARE CFST COLUMN MOMENT FRAMES UNDER BIDIRECTIONAL LOADING. The Hong Kong Institute of Steel Construction, June 2020. http://dx.doi.org/10.18057/ijasc.2020.16.2.7.

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AN EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF CONCRETE-FILLED STEEL TUBE (CFST) KEY-CONNECTED PREFABRICATED WALL AND COLUMN. The Hong Kong Institute of Steel Construction, September 2020. http://dx.doi.org/10.18057/ijasc.2020.16.3.2.

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